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D( x )
(7000-x)/(6999*x) <= 0
6999*x = 0
(7000-x)/(6999*x) <= 0
(7000-x)/(6999*x) <= 0
( 6999*x )
6999*x+0 <= 0 // - 0
6999*x <= 0 // : 6999
x <= 0/6999
x <= 0
( 7000-x )
7000-x <= 0
-x <= -7000 // * -1
x >= 7000
(-oo:0)(0:7000)(7000:+oo)6999*x-++7000-x++-
6999*x = 0
6999*x = 0
6999*x = 0 // : 6999
x = 0
x in (0:7000)
-5.376 = ln((7000-x)/(6999*x)) // - ln((7000-x)/(6999*x))
-ln((7000-x)/(6999*x))-5.376 = 0
-ln((7000-x)/(6999*x))-5.376 = 0 // + 5.376
-ln((7000-x)/(6999*x)) = 5.376
-ln((7000-x)/(6999*x)) = 5.376 // * -1
ln((7000-x)/(6999*x)) = ln(e^-5.376)
(7000-x)/(6999*x) = e^-5.376
(7000-x)/(6999*x)-e^-5.376 = 0
(7000-x)/(6999*x)+(6999*(-e^-5.376)*x)/(6999*x) = 0
6999*(-e^-5.376)*x-x+7000 = 0
(6999*(-e^-5.376)-1)*x+7000 = 0
((6999*(-e^-5.376)-1)*x+7000)/(6999*x) = 0
((6999*(-e^-5.376)-1)*x+7000)/(6999*x) = 0 // * 6999*x
(6999*(-e^-5.376)-1)*x+7000 = 0
(6999*(-e^-5.376)-1)*x+7000 = 0 // - 7000
(6999*(-e^-5.376)-1)*x = -7000 // : 6999*(-e^-5.376)-1
x = -7000/(6999*(-e^-5.376)-1)
x = -7000/(6999*(-e^-5.376)-1)
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